Alutu volcano in central Kenya. Picture of 2008 points to a rise in its activity. The change of color in the picture corresponds to the displacement of 2.8 cm of the soil
According to data obtained from satellites, it was found that many volcanoes on the planet, once considered dormant, long ago are not. In the article "On the monitoring of volcanoes," published in "Science", underlines the importance of developing a global system for tracking all the volcanoes of the Earth to better predict eruptions and timely planning evacuation of local residents.
Fortunately, for the majority of volcanic surveillance is ongoing. However, as described in an article in 16 developing countries out of 440 348 active volcanoes have no or imperfect tracking system, although 65 of these are potentially dangerous to the public.
The study authors propose as monitoring InSAR, interferometric synthetic aperture radar, which is to identify and analyze any hesitation surface uses two combined radar images acquired at the facility. This remote radar mounted on a satellite can watch those volcanoes that are inaccessible to ground-based monitoring, for example, are located in the tropics, where the volcano is hidden behind the clouds. Using this radar is already established that on Mount Longonot in Kenya came the phase of volcanic activity. The surface of the crater in two years rose by 9 cm
Besides InSAR, for such purposes will use satellites Sentinel, developed under the European program "Global Monitoring for Environment". Every 6 days satellites will transmit status data from all corners of the Earth.
Early warning of eruptions remains a difficult problem to be solved scientists. Until the end of unknown laws of the transition phase in the eruption of internal activity. But the introduction and use of satellite technology will help, believe researchers.
Interferogram Ethiopian ridge consisting of volcanic depressions and lakes. January 2009-April 2010. Concentric rings around volcanoes Alutu, Corbet and Bora indicate deformation of the surface.
Data on the activity of the volcano Etna, Sicily. During the period from 1992 to 2001 was more than 100 interferograms volcano illustrating the growth of its activity (increase).